FLH Milwaukee 8 Lower Fairing Mounted UltraCool Oil Cooler 2024 version


SKU: SMT8-6N Category:

Requires permanent modification of left lower fairing.

Download the installation guide here:

The M8 "Liquid Cooled" engines only water cool the exhaust ports on the engine. The stock cooling system simply is not enough to keep the larger M8s from overheating in traffic and city riding.  Adding a FLO Oil Filter and our 3.0 UltraCool Oil Cooler give the M8 engines the performance of a FULLY liquid cooled!  Don't believe that bold statement?  Just read the reviews by clicking on "Reviews" at the top of the page.  Note:  This kit can also be used on a non liquid cooled M8 Touring bike that has OEM lower fairings.

UltraCool is back and better than ever with its new M8 Lower Fairing Mounted Oil Cooler, The 3.0! Some cool new features including:

  • Fits FLH Milwaukee 8 Frames 2017-current Twin-Cooled Engine or non liquid cooled with OEM lower fairings
  • "Naked" (no covers) Side Mount
  • This "naked" version fits into the left lower fairing air door after modification
  • 3.0 Oil Adapter and Thermal Switch with waterproof connectors automatically turns on the powerful dual fans when your oil reaches 210 degrees and they stay on until the oil is cooled to 185 degrees. UltraCool's goal is to keep your oil at the optimal temperature of between 200 and 230 degrees.
  • 3.0 Specially designed dual pass aluminum heat exchanger with turbulators for maximum heat dissipation
  • 3.0 Sealed Waterproof IP68 Dual Fans producing an amazing 220 CFM of airflow
  • 3.0 plug and play wiring harness with relay and waterproof connectors that all connects to the battery under the seat for simple installation.
  • 3.0 Black nylon coated stainless steel braided oil lines with AN6 fittings.
  • 3.0 L.E.D. indicator light indicates when the fans are operating.
  • LED mount included in kit.
  • Special designed Oil Line Fitting Wrench and detailed instructions included.

 You may also need:

  • Check out this electrical connector you may need:  #SMB-Y128
  • We recommend using a FLO Oil Filters for additional cooling and are much easier to take on and off during oil changes with the tight fit of the UltraCool Lower Fairing Mounted Oil Cooler: PCS4B, PCS4C, and PCS4BC

1 year parts only warranty from date of purchase.
Enjoy our 30 day "no hassle" return/exchange policy.

*If you don't see your bike listed - call for fitment

Additional information

M8 2017- current Liquid Cooled

FLH Milwaukee 8 2017-currrent Dual Liquid Cooled

FLH Touring Models Fan Assisted Oil Cooler

The Reefer Harley Oil Cooler is the best Harley-Davidson® Oil Cooler system in the USA. Drop your motorcycle oil temp up to 50 degrees and save your bike from over heating!

UltraCool prides itself on producing the highest quality oil cooler in the market today. With our continuing pursuit and desire to improve our product, we have upgraded our FLH oil cooler with plenty of new features that include dual IP68 waterproof fans increasing air flow to 220 CFMs, a more durable thermal switch with built in wiring, plug n play wiring harness with waterproof connectors,  a highly rated Viton o-ring gasket with improved parts for our oil adapter, and a higher quality LED Light.

Harley Davidson oil cooler includes: